论文部分内容阅读
千兆比特以太网(GE:Gigabit Ethemet)的广泛使用,引起局域网(LAN)带宽的飞速增长;同时,Internet流量以每年300％的速度增长,也使得广域网(WAN)的带宽有了爆炸性的增长。剩下的就是LAIN和WAN之间的连接——城域网(MAN)。去年以来MAN就成了整个网络基础设施中充满激烈竞争的领域。不但业务需求快速的增长,网络结构、协议和技术也在经历彻底的改变。波分复用(WDM)的出现,高速光连接的增加以及话音和数据的融合都在推动现有网络结构的变革,以便满足对带宽的爆炸性需求。另外,MAN服
The widespread use of Gigabit Ethernet has led to a rapid increase in local area network (LAN) bandwidth; meanwhile, Internet traffic has grown at an annual rate of 300%, resulting in an explosive growth in the bandwidth of wide area networks (WANs) . The rest is the connection between the LAIN and the WAN - metropolitan area network (MAN). Since last year, MAN has become a fiercely competitive area in the entire network infrastructure. Not only are business needs fast-growing, but network architecture, protocols and technology are undergoing radical changes. The advent of wavelength division multiplexing (WDM), the addition of high-speed optical connectivity, and the convergence of voice and data are all fueling the evolution of existing network architectures to meet the explosive demand for bandwidth. In addition, MAN service